65% of Rock Grove township residents lived in the same house 5 years ago. Out of people who lived in different houses, 36% lived in this county. Out of people who lived in different counties, 93% lived in Illinois.

96.7% of residents of Rock Grove township speak English at home.
0.4% of residents speak Spanish at home (100% speak English very well).
2.9% of residents speak other Indo-European language at home (100% speak English very well).